wenzel



l 23, 1929. L B WENZEL 1,710,250

PISTON RING Filed sept. 19, 1925 ATToNEYs.

Patented Apr. 23, 1929.

UNITED STATES PATENT FFCE.,

JACOB B. WENZEL, 0F .'BLOOM, COLORAJ, ASSGNG'J't 'JPCl ALBERT WENEIEL, OF 32""lW ARK, NEW' PSTN Application filed September This invention relates particularly to pistou ringe oli the type .having` annular Qroovee or clu'umeie in the outer circ .un'ifren'tial eurifaeee thereof to receive oil troni the cylinder walls so au to maintain a conulent proper luliriealiou ot the eyliiuler and prevent the accumulatien olf an exoten-live aniou t oi' oil on the walls et the cylinder. More iliartieulv, the invention reatefs to a pleiten ring; l lia general character iu which traino/'eine igra are Atermed in the ring` and couiii'iunicale with Vthe annular oil groei/'e coraluetiug\ the oil tliroiufli the rino; inlo the pieton ring' groove and which coopera e with oiieniugs ioru'u-d in the pieton 'for eoudurt ino' @Xenea oil through the pieton haelt to the eraul; ase

One olijoet ol the invention is to provide a pieton ring; olE lliif.` character in which the lvaneveree paeeagree or elote in the rino' are no related lo the oil groom or f fhannel aa to permit the .wiz-ta heini; oit maximum oil ear rfngg capacity with a mininuun wealrgenlar un; el5 the ring` liotli in area el' ilaL hea ingV @urtare on the fyl|nller wall and the reelliency ol'Y the rin i,

ilrnol'her olijeet ie provide auch a pir-tten ringfj havingV en auilular recess or groove en the inner periphery thereof roniuuu'iicatiug with said Slot@ or traneverae passages to provide a storage Space or reservoir lor exreau oil so aa to 'facilitate in the draining ol5 the oil Alfrou'i the cylinder Walle.

`Further objects ot the iuv'eution are to provide a piston ringI oif the oil draining 'type ineli'ulingl an annular groove or channel in the outer periphery or hearing' surface thereof and a plurality oil? circumferentially ar "ringed transverse slots coiunuui'eating with said groove and ao arrangeffl relatively thereto as to permit a maximum number olf Said Slots Wthoiit material Wealnn'iing; ot the piston ring7 and to obtain other results and advantages as may he brought out hy the following description.

Referring to the acconipanyiugg` drawing, in Whicli. the same reference Characters deei nate Correspending,l and like parte tlui'oughout the several views,

Figure l is a fragmentary transverse vertical sectional view through a cylinder and a piston having a piston ring ei'uliodyiurY the invention applied thereto;

Figure 2 is an enlarged edge elevation ot the piston ring;

19, 1935. Serial N0. iii/359.

gure tl is a fragmentary traneveree ver- /tl eeetional View, taken on the line 3W?) o'l lligure 2;

Figure l ie a horizontal sectional view,`

taken on the line yimeioi? flligiue 2;

W'o I .i gli -r.. .12. et i iuic o le au Lugge eci/wien er a p1., oi. ring` Showing' a modified :ir 'angemont of the oil draining' uloteg Figure (i ie a irz'iggmeutury traneveree aow tional view through a cylinder wall, pieton and pieton ring* allowing; a modified torni ot the invention.

Specifically ileecribingr the embodiment o the invention Shown in Figures l-flf influ, :he relu'ence cliararier il designates a eyliu ler Within which is; reciproealile a, pieton il ravine' a. plurality ot pistou rinou grroovee (l. l) and lil te receive the pieton of; lf. fi et known typeQ and a rino lil coiuitruclrd iu eordanre with the inventimi. 'lhe pieton ll is provided 'with a plurality ot trauuverae oil drain managen il eonununiratiujr with the pin-tml ring; groove lll.

The pieton ring" eniliodyinol the iuvoritien i el the usual Split type maintained iu frirtioual enfragoiiuuit with the eyliiuler 'dalla liy its inherent oailienrv Un it o iler poriphery or herminev tace, the rinol e i ie irfwide-:l with au annular groove or channel l with au annular hearing eiilrt'ace Z arranged at carli Side tl ereo'l 'for engagement with the ryliu der Walla, A plurality olf traneveree aleta 3 are 'torined in the ring, alternate filete 3 lieingl disposed at oppoeite Sides ot the `ajii'oove l and cominuuicatingwith Said groove.Y W ith auch au arrangement ol the Slots, it will lie noted that they are out ot alinement with each other and thereby weaken the ring to a less extent than were they arranged in suh- Stantially circumterential alinement. thorinore, Such an arrangement of the Slots; will, permit of the groove 1 being oli less wid th than Would lio possible were the Slots ar-. ranged Within the groove. Since the area oit the slots outside olf the rroove produces the Same eilfect as 'the groove itself. It will thun lie observed that the slot-e 3 may he arrangeil closely adjacent each other, and Where desiraliile overlap each other, as shown in Figure 3, eo that a maximum number oi Slots may loe provided in the ring with a min imuiu weakening; of the ringl both in the area et ite liearing surface and the resiliency et the ring. Accordingly, a maximum draining` capacity is obtained.

Fur

ltlll l fifi llO groove.

"the oil from the cT linder'walls and intov the j u n Should an excessive amount `of oil bevrenioved from thel'cylinder walls, it will be conducted b y the slots l3 into the piston ring groove E and -from there through the drain passages l to the crank case. fit the same time, the groove l serves to distribute a certain amount of oil upon the cylinder walls so `as to maintain the latter properly lubricated.

In some motors, such an excessive amount of oil acci'unulates on the cylinder walls as cannot be drained olli sufliciiently liast by the openings l in the pist-on on the downward stroke oi" the piston, and in such cases l may provide an oil storage groove or reservoir 4 on the inne`- periphery ot the ring, as shown in Figure 6, said groove preferably having a wall 5 inclined inwardly from the lower Side ol the ring lor directing oil by action of gravity to the bottom of the piston ring groove. ln operation, the oil runs through the transverse slots in the ring as above described, and collects in the groove l from where it drained oli through the openings l in the piston, bviously, the groove lwill accommodate a large amount of excess oil such as might be splashed upon the cylinder walls at various times, thereby ensuring a uniform iihn of oil on the cylinder walls even under such conditions; and should all the eX# cess oil tail to drain through the openings ll on the donfnward strolre of the piston the groove l will accommodate the ren'iainder of the excess oil during the next upward stroke ol the piston. lWithout the groove l, it will Abe obvious that should an abnormal excess of oil pass through the slot 3, it would miente be restricted in the piston ring groove and consequently not drain oli tast enough to prevent it from leaking arouiiwd the piston ring and back onto the cylinder walls.

The bearing surface of the ring shown in'v Figures l-4l inclusive also might be concave, as shown in Figure 5, to expedite wearing in7 lto proper engagement with the cylinder walls, and the groove l will effectively lubricate the sharp edges of the ring during'the @wearing in action.

jWhile l have shown and described piston rings embodying certain details of construction, it will be understood that this is primarily ter the purpose oit illustrating the principles ol the invention, and'that many modilieations une changes may be made in the shapes of the grooves rand slots and the rela# tion thereoil2 to each other, without departing from the spirit or scope of the invention. Therefore, l do not desire to be understood as limiting myself except as required by the following claim when construed in the light of the prior art. n

`llavin thus described the invention, what claim is:

The coinbin ation of a hollow piston having a piston ring groove and openings leading lroin said groove into the interior of said piston, el a piston ring having a circumferential groove in its outer peripheral surface, and a plurality olf elongated circumferential transverse slots in 'the ring opening through said peripheral surface and alternately disposed in opposite sides of said groove parallel therewith and each opening into said groove throughout the length of one side of the slot. Y

JACOB B. lVENZEL. 

